Sahih Muslim 2492
صحيح مسلم#2492SahihAbdullah b. Abu Aufa said that it was the common practice of the Messenger of Allah (ﷺ) that when the people brought to him sadaqa he blessed them:O Allah, bless them. So when Abu Aufa brought to him Sadaqa he (the Holy Prophet) said: O Allah, bless, the posterity of Abu Aufa
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 12:229